Spin crossover in soft matter

Gaspar, Ana B.; Seredyuk, Maksym

doi:10.1016/j.ccr.2014.01.018

Cited by 142 publications

(98 citation statements)

References 86 publications

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“…Spin-crossover complexes [16][17][18][19][20] are particularly interesting for such purpose, as they can exist in two stable spin states and have been largely studied. Even if spin-crossover behavior is theoretically expected to occur in octahedral complexes with 3d 4 to 3d 7 electronic configurations, most spin-crossover complexes are based on Fe(III), Fe(II), and Co(II), with only few reported examples of compounds of Mn(II), Mn(III), Cr(II), and Co(III).…”

Section: Introductionmentioning

confidence: 99%

“…Several stimuli have been used to trigger magnetic properties changes [3] in three main areas: (i) changing the spin state of a transition metal in spin crossover (SCO) systems [4][5][6][7][8][9][10][11]; (ii) switching the exchange interaction between different spin carriers [12,13]; and (iii) switching single-molecule magnet (SMM) properties [14,15]. Spin-crossover complexes [16][17][18][19][20] are particularly interesting for such purpose, as they can exist in two stable spin states and have been largely studied. Even if spin-crossover behavior is theoretically expected to occur in octahedral complexes with 3d 4 to 3d 7 electronic configurations, most spin-crossover complexes are based on Fe(III), Fe(II), and Co(II), with only few reported examples of compounds of Mn(II), Mn(III), Cr(II), and Co(III).…”

Section: Introductionmentioning

confidence: 99%

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Switching Magnetic Properties by a Mechanical Motion

et al. 2018

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Switching magnetic properties have attracted a wide interest from inorganic chemist for the objectives of information storage and quantum computing at the molecular level. This review is focused on magnetic switches based on a mechanical motion, which is an innovative approach. Three main strategies to control magnetic properties by a mechanical motion have been developed in the literature and will be described. The first one (ligand-induced spin change) consists in modulating the ligand field strength by a configuration change of the ligand in spin-crossover complexes. The second one (coordination-induced spin-state switching) is based on a change in the coordination number of a metallic center that is triggered by the motion of one ligand. The third one uses the modulation of the exchange interaction between two spin-centers by a mechanical motion.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Switching Magnetic Properties by a Mechanical Motion

et al. 2018

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“…7 Moreover, in addition to their own intrinsic functionality, spin-transition molecules can be auxiliary switching centers 8 in multifunctional fluorescent, 9 semiconducting 10 and magnetic materials. 11 The spin-transition phenomenon also functions in soft materials 12 and at the nanoscale, 13 and the relationship between particle size and switching functionality is now quite well understood. 14 Thanks to this wide applicability, SCO complexes are one of the most widely studied types of functional molecule-based material.…”

Section: Introductionmentioning

confidence: 99%

Structures and spin states of crystalline [Fe(NCS)₂L₂] and [FeL₃]²⁺complexes (L = an annelated 1,10-phenanthroline derivative)

Kulmaczewski

Halcrow

2016

CrystEngComm

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The phase behaviour and spin states of [Fe(NCS)2(dpq)2] (1; dpq = dipyrido[3,2-f:2',3'-h]quinoxaline), [Fe(NCS)2(dppz)2] (2; dppz = dipyrido[3,2-a:2'3'-c]phenazine) and [Fe(NCS)2(dppn)2] (3; dppn = dipyrido[3,2-a:2'3'-c]benzophenazine) have been investigated. Solvent-free 1 and 2 are isostructural and low-spin in the crystalline state, in contrast to previously published 2·py (py = pyridine) which exhibits a hysteretic spin-crossover (SCO) transition near 140 K. The inactivity of 1 and 2 towards SCO may relate to their more crowded intermolecular lattice environment, particularly two very short intermolecular anion… contacts involving the NCS ligands. Two solvate phases of 1 are also described, including 1·2py which undergoes gradual SCO with T½ ca. 188 K. Bulk samples of 2 and 3 are predominantly low-spin and isostructural with the crystals of 2 by powder diffraction, but bulk samples of 1 contain an extra phase that exhibits hysteretic SCO, but was not crystallographically characterised. Crystal structures of low-spin [Fe(dppz)3][ClO4]2 (4) and a solvate of [Fe(dppn)3][BF4]2 (5) are also described, and are the first homoleptic complexes of these ligands to be crystallographically characterised.

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“…2,3,[7][8][9] Among these, the most extensively studied SCO materials are complexes of iron(II) (d 6 ), 4,10,11 and cobalt(II) (d 7 ), 12,13 which have attracted the interest of many researchers as potential functional materials in fields such as molecular electronics, memory storage, thermochromic indicators and sensors. 14,15 However such applications require that the spin transition occurs abruptly at ambient temperature (ideally room temperature) and with wide thermal hysteresis (for memory effect).…”

Section: Introductionmentioning

confidence: 99%

Spin-crossover, mesomorphic and thermoelectrical properties of cobalt(ii) complexes with alkylated N₃-Schiff bases

et al. 2015

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2 O (3), where L [12][13][14][15][16] are N 3 -Schiff bases appended with linear C 12-16 carbon chains at the nitrogen atoms, were obtained in good yields by facile one-pot reactions. The single crystal X-ray structure of complex 1 shows a tetragonally compressed CoN 6 coordination geometry. The melting temperatures of 1 -3 were lower than 373 K, while their decomposition temperatures were above 473 K. All complexes have high-spin Co(II) centres at 300 K and exhibit a columnar mesophase above 383 K. Complexes 1 and 3 showed a normal thermal spin-crossover behaviour with weak hysteresis loops at about 320 K. Hence, these complexes showed uncoupled phase transitions (class iiia). 1 The values for the Seebeck coefficient (S e ) of the cobalt redox couples formed from 1 and 2 were 1.89±0.02 mV K -1 and 1.92±0.08 mV K -1 , respectively, identifying them as potential thermoelectrochemical materials.

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Spin crossover in soft matter

Cited by 142 publications

References 86 publications

Switching Magnetic Properties by a Mechanical Motion

Switching Magnetic Properties by a Mechanical Motion

Structures and spin states of crystalline [Fe(NCS)₂L₂] and [FeL₃]²⁺complexes (L = an annelated 1,10-phenanthroline derivative)

Spin-crossover, mesomorphic and thermoelectrical properties of cobalt(ii) complexes with alkylated N₃-Schiff bases

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Spin crossover in soft matter

Cited by 142 publications

References 86 publications

Switching Magnetic Properties by a Mechanical Motion

Switching Magnetic Properties by a Mechanical Motion

Structures and spin states of crystalline [Fe(NCS)2L2] and [FeL3]2+complexes (L = an annelated 1,10-phenanthroline derivative)

Spin-crossover, mesomorphic and thermoelectrical properties of cobalt(ii) complexes with alkylated N3-Schiff bases

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Structures and spin states of crystalline [Fe(NCS)₂L₂] and [FeL₃]²⁺complexes (L = an annelated 1,10-phenanthroline derivative)

Spin-crossover, mesomorphic and thermoelectrical properties of cobalt(ii) complexes with alkylated N₃-Schiff bases